class User:
    """一个表示用户的简单类"""

    def __init__(self, first_name, last_name, username, email, location):
        """初始化用户"""

        self.first_name = first_name.title()
        self.last_name = last_name.title()
        self.username = username
        self.email = email
        self.location = location.title()

    def describe_user(self):
        """显示用户信息摘要"""

        print(f"\n{self.first_name} {self.last_name}")
        print(f" Username: {self.username}")
        print(f" Email: {self.email}")
        print(f" Location: {self.location}")

    def greet_user(self):
        """向用户发出个性化的问候"""

        print(f"\nWelcome back, {self.username}!")


eric = User('eric', 'matthes', 'e_matthes', 'e_matthes@example.com',
            'alaska')
eric.describe_user()
eric.greet_user()

willie = User('willie', 'burger', 'willieburger', 'wb@example.com',
              'alaska')
willie.describe_user()
willie.greet_user()